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First trimester

10 weeks pregnant

At 10 weeks, the face is becoming more distinct, the outer ears are forming and the fingers and toes are no longer webbed. Cell-free DNA screening can be done from now, and the window for first-trimester screening opens.

This page covers 10 weeks 0 days to 10 weeks 6 days (10+0 to 10+6), counted from the first day of the last period. Check how far along you are

Enter it to see the calendar dates of your week 10.

Botanical illustration of a strawberry

About the size of a strawberry

Typical crown-rump length 3.3 cm to 4.2 cm (1.3 in to 1.7 in) across this week, from the Robinson equation.1

A reference value, not a measurement of your baby.

How your baby is developing

  • Facial features are becoming more distinct. The eyelids are more developed and beginning to close, the outer ears are taking shape, and the nose has two small nostrils.2,3
  • The arms, hands, fingers, feet and toes are fully formed, with no more webbing between the fingers. Fingernails and toenails are beginning to develop.4
  • The jaw bone is forming and holds the beginnings of the baby teeth. The intestines are rotating into position.2,3
  • The head is still large for the body, but the face looks more in proportion. Small, jerky movements can now be seen on an ultrasound, although you will not feel them yet.3
  • By the end of week 10, the embryonic period is over and the developing baby is called a fetus until birth.2

Changes you may notice

Everyone’s experience is different. You may notice some of these, or none.

  • Your uterus is growing, and some people find their usual jeans or waistbands are getting harder to fasten.3
  • Bloating, burping and passing wind are common. The hormone progesterone relaxes muscles so the uterus can expand, and it also relaxes the digestive tract, which can lead to indigestion and heartburn.3
  • Eating smaller meals more often, not eating late at night, eating slowly and taking a short walk after meals may help with digestive symptoms. Some people notice symptoms after coffee or rich, spicy or fatty food.3
  • Tiredness, nausea, dizziness, mood swings and greasier or spotty skin are also common now. If any symptom worries you, talk to your midwife or doctor.3

Care around this week

  • In the US, cell-free DNA screening can be done from 10 weeks, and first-trimester screening is done between 10 weeks 0 days and 13 weeks 6 days. Genetic screening should be offered to everyone, and it is your choice whether to have it.5
  • Cell-free DNA screening needs enough DNA from the placenta in your blood, which typically happens around the tenth week. Testing too early can mean the test cannot give a result.6
  • UK note: the combined test screens for Down's, Edwards' and Patau's syndromes. It pairs a blood test at 10 to 14 weeks with a measurement of the fluid at the back of the baby's neck at the dating scan, at 11 to 14 weeks. Results usually arrive within 2 weeks.7

Questions to ask your provider

  • Is now a good time for my cell-free DNA screening blood test, or should I wait?
  • When is my dating ultrasound, and do I need to prepare for it?
  • Which conditions does the screening I am offered look for?
  • What can I take for heartburn or indigestion during pregnancy?
When to contact your provider straight away

Call 911 (US) or 999 (UK) in an emergency, such as heavy bleeding or bleeding with severe pain, a seizure, chest pain, or severe trouble breathing.9,10,11,12

These symptoms are not always serious, but each one needs prompt advice from your provider, midwife or maternity unit (or NHS 111 in the UK if you cannot reach them) rather than waiting for your next appointment, and it helps to tell them you are pregnant.

  • Vaginal bleeding or spotting at any stage of pregnancy. Call 911 or 999 if the bleeding is heavy or comes with severe belly pain, shoulder pain, or feeling faint or dizzy.11,13
  • Fluid leaking or gushing from your vagina, or discharge that is unusual for you. Get checked straight away if the fluid is greenish, colored or smells bad.11,12,14,15
  • Your baby moving less than usual, not moving, or a change in their usual pattern of movements. Call immediately, even in the middle of the night, and do not use a home Doppler to check yourself.11,16
  • A severe headache that does not go away with simple painkillers or gets worse, or sudden changes in your vision such as blurring or seeing flashing lights.9,11,12
  • Sudden swelling of your face, hands or feet, or swelling, redness or pain in a leg.9,11,12
  • Belly pain that is severe or does not go away after resting, or pain just below the ribs.9,11,17
  • Regular tightenings or contractions, period-type pains, or backache that is unusual for you before 37 weeks, which can be signs of preterm labor.15,17
  • A fever of 100.4°F (38°C) or higher, or feeling hot, cold or shivery.11,12,15
  • Shortness of breath that comes on suddenly or happens when you lie flat, chest pain, a racing or pounding heart, or dizziness or fainting.11,12
  • Very itchy skin, especially on the palms of your hands or soles of your feet, or itching that is worse at night.18
  • Being sick so often that you cannot keep food or drink down, or signs of dehydration such as dark urine, peeing very little, or feeling dizzy.11,19
  • Thoughts of harming yourself or your baby. Get help right away, and call 911 or 999 if you think you might act on them.11,20

Questions about 10 weeks

Can you hear the heartbeat at 10 weeks?

Sometimes. MedlinePlus notes that heart sounds may be detectable with a handheld Doppler around the end of week 10, but not always this early. An ultrasound scan can show the heartbeat.2,8

When can I have cell-free DNA screening (NIPT)?

It can be done from 10 weeks. Before then, there may not be enough placental DNA in your blood for the test to work. It is a screening test, so a higher-chance result needs diagnostic testing to confirm it.5,6

Why am I so bloated at 10 weeks?

Progesterone relaxes the muscles of your digestive tract as well as your uterus, which can cause bloating, burping and wind. Smaller, more frequent meals and eating slowly may help.3

Sources

  1. A critical evaluation of sonar “crown-rump length” measurementsBritish Journal of Obstetrics and Gynaecology 82(9):702–710, 1975
  2. Fetal developmentUS National Library of Medicine
  3. Week 10 – week-by-week guide to pregnancyNHS Best Start in Life
  4. Fetal development: stages of growthCleveland Clinic
  5. Practice Bulletin No. 226: Screening for Fetal Chromosomal AbnormalitiesAmerican College of Obstetricians and Gynecologists, 2020
  6. What is noninvasive prenatal testing (NIPT) and what disorders can it screen for?MedlinePlus Genetics, US National Library of Medicine
  7. Screening for Down's syndrome, Edwards' syndrome and Patau's syndromeNHS (England)
  8. Week 12 – week-by-week guide to pregnancyNHS Best Start in Life
  9. Pre-eclampsiaNHS (England)
  10. Epilepsy and pregnancyNHS (England)
  11. Urgent Maternal Warning Signs and Symptoms (Hear Her campaign)US Centers for Disease Control and Prevention
  12. Pregnancy symptoms you need to get help forNHS (England)
  13. Vaginal bleeding in pregnancyNHS (England)
  14. Signs of going into labourNHS Best Start in Life
  15. Premature labour and birthNHS (England)
  16. Your baby's movementsNHS (England)
  17. Stomach pain in pregnancyNHS (England)
  18. Itching in pregnancyNHS (England)
  19. Severe vomiting in pregnancyNHS (England)
  20. Depression in pregnancyNHS (England)

Links checked November 12, 2026. Citing a source does not mean it endorses this site.

Written from the sources above and checked against them on 2026-11-12. Not reviewed by a clinician. Our editorial policy